Precise forced induction management is the key to unlocking consistent power from the 4.4-litre twin-turbo layout. The intense heat and pressure generated by tuned S63 engines can quickly overwhelm factory boost management hardware. Optimize your system with high-grade boost control products and heavy-duty actuators to ensure rock-solid pressure holding across the rev range. Upgrading your factory plastic bypass valves to high-performance diverter valves guarantees rapid boost recovery during lightning-fast M Steptronic gear shifts, preventing boost leaks and eliminating damaging compressor surge.